First time I had to use Synaptic (i'm a newbie) I couldn't figure out which package was broken. Nothing happened when I used ' fix broken packages'. I must have done something wrong. I will do some more research on how to use Synaptic;-)But I did solve the problem. I used the command sudo apt-get dist-upgrade to figure out which package caused the problem. It was gimp-plugin-registry. I removed it and then I could update.Hopefully I can re-install the package without causing any problems.Thanks a lot!